Lululemon's business took a hit last month after the company had to recall 17 percent of its pants for being too sheer. While the company eventually identified the problem in its testing process, the brand's value was damaged.

"Despite the fact that managers have discretion to make exceptions, the strict return policy is a reason for a new customer not to make a purchase," Poser wrote in an emailed note.

Customers have complained about the policy in the past.

Take this Yelp review of a customer who said the return policy meant she wouldn't be going back:

"Lululemon- when you wrong a customer and misinform them, it's your job to make it right. Shame on you. You have lost a customer and many future purchases for failing to simply take back the pant so I can purchase the one I originally wanted but was told, incorrectly by your salesperson, doesn't exist."